The pet- and people-friendly expo features more than 100 vendors selling pet-related items, clothing and more, 10 a.m.-7 p.m. Saturday, March 3, and 10 a.m.-5 p.m. Sunday, March 4, at Suffolk County Community College, 1001 Crooked Hill Rd. in Brentwood. New this year is a course that tests your animal’s agility, rabbit hopping and feathered friends, courtesy of the Long Island Parrot Society. Back again is Diana Frohman and her dancing goldens. If you’re looking for a pet, check out the adoption and animal rescue groups. Admission:$13, $6 ages 4-12 (discounts available online); weekend passes available online only: $18, $8…